Hello, Here is something for you guys to think about: Two rifles, both 26" barrels. One a .22 Hornet, The other .222 Rem. Bullet for Hornet, 55gr. g.c., Bullet for .222, 58-60gr. g.c. Hornet charge: 7.0grs., .222 charge 10.0grs.
With the Hornet, only ear plugs are needed. With .222 I MUST wear muffs. Only 3.0gr. difference in powder charge! I'm thinking it must be the 30' shoulder on .222 case vs. 5' or so of Hornet, holding back gas to increase pressure. Any thoughts on this? Best of luck!